You’ve got one of those nice Dell U2410 monitors for your photo work.

You’ve got a puck, like the i1Profile, to drop across the screen to calibrate it.

And you’ve got the profiler software, with lots of options… just like the monitor has lots of options.

So, conscientious photographer that you are, you head off into tweaking this and that: R,G and B values and so on, using the Custom Color section of the U2410 menu.

Wrong.

If your goal, as it should be, is to get the most accurate color you can, with the lowest delta (difference between what should be and what is) that you can, the process is incredibly simple:

Set the Dell to preset mode AdobeRGB. Hang your puck on the screen, run your software, set the target brightness to 80 cd/m, and hit the go-button.  (Side note: personally, I choose the largest number of color targets in my X-Rite 1Profiler app; a couple hundred if memory serves…)

Either way, the factory-calibrated AdobeRGB is much closer to perfect than you’re likely to ever get by tweaking the individual guns, contrast, brightness, hue, saturation and yadda yourself.